Pulsation eliminator for pumps



June 24, 1930. v. TANNEHILL 1,767,100

PULSATION ELIMINATOR FOR PUMPS Filed July 9, 19728 Q, I Z 1% PatentedJune 24, 1930 UNITED STATES PATENT VERNON L. TANNEHILL, or roar WAYNE,r-nnraiya-nssronoamp 393,1 WAYNE GINEERING & MANUFACTURING co, or roarWAYN IND ANA PULSATION ELIMm ifror; on ru e Application filed July 9,ages. s al u -aerate.

This invention relates to a pulsation eliminator for pumps.

In automatic water pumps, it has been found that where the automaticcontroller is connected directly to the air cushion chamber of the pumpand not to the pressure tank, pulsations are transmitted to thecontroller with consequent rapid wear and frequent need of adjustments.

Further defects which have resulted from this arrangement are that whenthe cushion chamber of the pump is water logged, or in other words,completely filled with water, the controller automatically flops in andflops out of position for each stroke of the pump.

This invention is designed to overcome the defects noted above, andobjects of such invention are to provide a novel form of pulsationeliminator for pumps which is so constructed that it will permit theconnection of the controller directly to the discharge end of the pump,and which will prevent any transmission of pulsation whatsoever to thecontroller, irrespective of whether or not the main or primary chamberof the pump is water logged or filled with air.

Further objects are to provide a very simple type of structure whichdoes not require much additional space, which is easy to produce, andwhich is very easy to apply.

An embodiment of the invention is shown in the accompanying drawing inwhich:

The single figure is a sectional view through the device showing itconnected with the discharge end of a pump and with a controller.

Referring to the drawing, it will be seen that the pump is indicatedgenerally by the reference character 1 and that its discharge 4 end orportion communicates by means of the T 2 with a discharge or deliverypipe 3 and with the lower end of the primary air chamber or cushioningchamber 4 for the pump. This cushioning chamber has a laterallyextending portion 4 which is provided with a threaded upper apertureinto which a throttling nipple 5 is screwed. This throttling nipplecarries an auxiliary air chamber or cushioning chamber 6. The

upper end of this auxiliary cushion chamber or air chamber communicateswith the lower portion of the controller 7" by-niea'nsof the throttlingnipple 8 similar to the "nippl 5. The 1 diaph agm 9 and the pressurehead or plate 10 of the controller have been indi cat'ed in thedrawing.i

' Each of the cushion nipples is provided with a'relatiyel-y large pasage-1 1 from which extends restricted" or throttled passage 12. In theoperation of the device, it is apparent that the main cushioning for thewater delivered by thepump takes place in the primary chamber 4 in theusual manner and thus takes away the shocks from the delivery portion ofthe system. The pressure, however, within the primary chamber 1 issomewhat pulsating even under the best conditions. However, thepulsations are slowed down or greatly lessened by passage through thethrottling nipple 5 into the auxiliary chamber 6. Here, the slightremaining pulsation is almost wholly eliminated and is totallyeliminated by the cooperative action of the throttling nipple 8 prior toreaching the diaphragm 9 of the controller.

In other words, applicant has provideda pulsation eliminator which isprovided with an entrance through a throttling nipple and with an exitthrough a throttling nipple,

such chamber being adapted to contain air and to thereby cushion anypulsation that may pass the first nipple.

From actual tests conducted with this device, it has been found that thepulsations are wholly eliminated before they can arrive at the diaphragmof the regulator or controller. It has been found that the eliminationof the pulsation occurs not only when the primary chamber contains air,but also when the primary chamber is water logged or is free from anyair whatsoever. Even under these severe conditions, pulsations are nottransmitted to the controller and consequently it is possible even underthe most disadvantageous conditions to have a perfectly workingcontroller, although mounted directly upon the pump.

It will be seen further that the device is very simple, may be readilymanufactured,

and easily applied.

Although the invention has been described in considerable detail, suchdescription is intended as illustrative rather than limiting as theinvention may be variously embodied and as the scope of such inventionis to be determined as claimed.

I claim:

The combination of a water pump having a delivery portion, a primary airchamber communicating with said delivery portion, a lateral extension onsaid primary air chamher having a threaded upper aperture, an auxiliaryair chamber, a throttling nipple having one end connected with theauxiliary air chamber and the other end threaded into the aperture onthe lateral extension, acontroller and a second throttling nippleproviding communication between said controller and the auxiliary airchamber.

In testimony that I claim the foregoing I have hereunto set my hand atFort Wayne, in the county of Allen and State of Indiana.

VERNON L. TANNEHILL.

